RATIOS and

PROPORTIONS


Expressing Proportions

Proportions express Equality between Two Ratios.




Setting up the Proportion

When two ratios share the same relationship, the proportion of the

first ratio is the same as the proportion of the second ratio.


1:2
is the same as
2:4



The mathematical formula showing the equal proportion is


1
:
2
::
2
:
4



The mathematical formula is read as


1
IS TO
2
AS
2
IS TO
4







More examples of Proportions


2
:
3
::
12
:
18
2
IS TO
3
AS
12
IS TO
18



1
:
4
::
8
:
32
1
IS TO
4
AS
8
IS TO
32



3
:
10
::
15
:
50
3
IS TO
10
AS
15
IS TO
50